- No concurrent strong CYP3A4 inhibitors (e.g., ketoconazole, itraconazole, clarithromycin, atazanavir, nefazodone, saquinavir, telithromycin, ritonavir, amprenavir, indinavir, nelfinavir, delavirdine, voriconazole, or grapefruit juice) or CYP3A4 inducers (e.g., dexamethasone, phenytoin, carbamazepine, rifampin, rifampicin, rifabutin, phenobarbital, or St. John wort)